diff --git a/plot_single_transmission_EM9190.py b/plot_single_transmission_EM9190.py
index b88ee71..64c7cad 100755
--- a/plot_single_transmission_EM9190.py
+++ b/plot_single_transmission_EM9190.py
@@ -101,10 +101,10 @@ if __name__ == "__main__":
 
         # sum bandwidth
         # columns: LTE_bw, LTE_SCC2_bw, LTE_SCC3_bw, LTE_SCC4_bw, SCC1_NR5G_bw, NR5G_dl_bw, NR5G_ul_bw, LTE_SCC1_bw, NR5G_bw
-        serial_df["bw_sum"] = serial_df["LTE_bw"] + serial_df["LTE_SCC2_bw"] \
-                            + serial_df["LTE_SCC3_bw"] + serial_df["LTE_SCC4_bw"] \
-                            + serial_df["SCC1_NR5G_bw"] + serial_df["NR5G_dl_bw"] \
-                            + serial_df["LTE_SCC1_bw"]
+        serial_df["bw_sum"] = serial_df["LTE_bw"].dropna() + serial_df["LTE_SCC2_bw"].dropna() \
+                            + serial_df["LTE_SCC3_bw"].dropna() + serial_df["LTE_SCC4_bw"].dropna() \
+                            + serial_df["SCC1_NR5G_bw"].dropna() + serial_df["NR5G_dl_bw"].dropna() \
+                            + serial_df["LTE_SCC1_bw"].dropna()
         serial_df["bw_sum"] = serial_df["bw_sum"].apply(lambda x: int(x))
 
         transmission_df = pd.merge_asof(